优化hierarchy

即时生成和删除tab（不会做动态刷新
基本上hierarchy的性能就到这了，之后还是做点辅助工具防止1000+的栏展开吧
（重要）bug测试不完全，需要再加改进

Assets/Scripts/GameElements/GameCamera/GameCamera.cs

@@ -12,7 +12,7 @@ namespace Ichni.RhythmGame
 {
     public partial class GameCamera : GameElement, IHaveTransformSubmodule, IHaveTimeDurationSubmodule
     {
-        public Camera camera;
+        public new Camera camera;
         public Transform rotationPoint;
         public Transform positionPoint;
         public Transform cameraTransform;